| **Income Taxes Income Taxes (Schedule of Unrecognized Tax Benefits Rollforward) (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended |        |
|--------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------|
||
| **Income Tax Disclosure [Abstract]**                                                                                                       |            |   |   |   |
| Unrecognized Tax Benefits                                                                                                                  | $ 315           | $ 314  | $ 205 | $ 163 |
| Unrecognized Tax Benefits, Increases Related to Current Period Tax Positions                                                               | 74              | 38     | 33 |   |
| Unrecognized Tax Benefits, Increases Related to Prior Period Tax Positions                                                                 | 33              | 90     | 16 |   |
| Unrecognized Tax Benefits, Reductions Related to Prior Period Tax Positions                                                                | (16)            | (18)   | (1) |   |
| Unrecognized Tax Benefits, Reductions related to Settlements/Payments                                                                      | (90)            | (1)    | (2) |   |
| Unrecognized Tax Benefits, Expiration of the statute of limitations for the assessment of taxes                                            | $ 0             | $ 0    | $ (4) |   |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.
+ References
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| - Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.
+ References
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.
+ References
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